Device for controlling an output level of an FM detecting circui

Details Device for controlling an output level of an FM detecting circui Device for controlling an output level of an FM detecting circui

1996-04-16

1997-04-15

Mis, David

Demodulators

Frequency modulation demodulator

Input signal combined with local oscillator or carrier...

329318, 331 23, 455214, 4552451, 455337, H03D 300, H03L 708

Patent

active

056213492

ABSTRACT:
An FM detecting circuit using phase locked loop (PLL) is disclosed. A reference voltage unit generates a reference voltage. A phase detector detects a phase difference between an FM signal and another frequency signal. A low-pass filter receives the output signal from the phase detector, and outputs a detected signal by passing only low frequency signals. A DC component detector receives the output signal from the low-pass filter, and detects a DC component. A voltage controlled amplifier receives the reference voltage and the voltage output from the DC component detector, and outputs a constant level voltage by controlling a gain based upon the difference between the two received voltages.

REFERENCES:
patent: 4096360 (1978-06-01), Takahashi et al.
patent: 4107624 (1978-08-01), Turner
patent: 4463317 (1984-07-01), Kusakabe
patent: 4479091 (1984-10-01), Yoshisato

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